Roller skate



FIG. 1 is a perspective view of a roller skate showing our new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is another top plan view thereof showing the design in an adjusted condition;

FIG. 8 is a side elevational view thereof; and

FIG. 9 is a bottom plan view thereof. 

The ornamental design for a roller skate, as shown and described. 